Ulf Stark is the author of around 30 books for children and young adults, including Fruitloops and Dipsticks, My Friend Percy's Magical Gym Shoes, My Friend Percy and The Sheik, Can You Whistle, Johanna?, and My Friend Percy and Buffalo Bill. He has written film, TV and theatre scripts, and won many prizes in Sweden and internationally. Julia Marshall of Gecko Press is his New Zealand translator and publisher.